Hex Models, Garry's Mod not responding

I have hex Four Counter Strike Source models into Garry’s Mod. The problem is that every time I view or spawn the models my Garry’s Model freezes up and ultimately windows takes over from there and asks me to close the window. Now if you know windows 7 this last step your basically screwed you are forced to close the window and relaunch your program.

Now I have read 2 different Hex tutorial and they both are the similar nothings really different. I was wondering if this is a common accurance or the models I might be using are causing problems. For what ever reason I can’t figure out the problem.

Can anyone help me?

Edit: The models I am using are weapon models.